Keywords

Evaluation, soil pollution, heavy metals, grey relational analysis

Abstract

A grey relational analysis (GRA) has been used to evaluate soil
contamination recently. In this study, the GRA model combined
with geographic information system (GIS) was successfully used to
evaluate the soil environmental quality. We analysed seven trace
elements (As, Cd, Cr, Cu, Hg, Pb, and Zn) that are indicators of
soil contamination in the agricultural area of the Shunyi district
of Beijing, and the GRA and geochemistry mapping was used to
evaluate the pollution level of heavy metals in soils. Results revealed
that 1.94% of soil samples contained a low pollution level (grade III
soil). Spatial distribution of heavy metal pollution levels in soils of
the studied area indicated that the environmental quality of most
of the areas was at a safe level. There were some zones with low
pollution levels at the northwest and central locations in the studied
area.